The Lens Eyepiece, cataloged under National Stock Number 4920-01-042-3566, is classified within Federal Supply Class 4920 (Aircraft Maintenance and Repair Shop Specialized Equipment) of the Maintenance and Repair Shop Equipment group. The manufacturer of record is Gaertner Scientific Corporation. The record lists 1 manufacturer part number for this item, enabling identification through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.
| Item Name | Lens Eyepiece |
| FSC / FSG | 4920 — Aircraft Maintenance and Repair Shop Specialized Equipment (FSG 49) |
| Manufacturers | Gaertner Scientific Corporation (CAGE 23876) |
| Parameter | Value |
|---|---|
| NSN | 4920-01-042-3566 |
| Primary Part Number | M239 |
| Item Name | Lens Eyepiece |
| FSC / FSG | 4920 / 49 — Aircraft Maintenance and Repair Shop Specialized Equipment |
| Manufacturer | Gaertner Scientific Corporation |
| Status | ACTIVE |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Part Number | Manufacturer |
|---|---|
| M239 PRIMARY | Gaertner Scientific Corporation (USA) |
| Reference | Meaning |
|---|---|
| 21016225-102 | 7/2 Vendor item drawing reference U.S. Government activity |
NSN 4920-01-042-3566 is a Lens Eyepiece, manufactured by Gaertner Scientific Corporation, classified under FSC 4920, Aircraft Maintenance and Repair Shop Specialized Equipment. Status: active.
NSN 4920-01-042-3566 has 1 manufacturer part number on file: M239 (Gaertner Scientific Corporation).
No hazard code in the DLA record (HMIC N). Hazard information on this page is shown exactly as it appears in the DLA record.
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-16.
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-18.